var Url = {
        // public method for url encoding  
        encode: function(string){
            return escape(this._utf8_encode(string));
        },
        // public method for url decoding  
        decode: function(string){
            return this._utf8_decode(unescape(string));
        },
        // private method for UTF-8 encoding  
        _utf8_encode: function(string){
            string = string.replace(/\r\n/g, "\n");
            var utftext = "";
            for (var n = 0; n < string.length; n++) {
                var c = string.charCodeAt(n);
                if (c < 128) {
                    utftext += String.fromCharCode(c);
                }
                else 
                    if ((c > 127) && (c < 2048)) {
                        utftext += String.fromCharCode((c >> 6) | 192);
                        utftext += String.fromCharCode((c & 63) | 128);
                    }
                    else {
                        utftext += String.fromCharCode((c >> 12) | 224);
                        utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                        utftext += String.fromCharCode((c & 63) | 128);
                    }
            }
            return utftext;
        },
        // private method for UTF-8 decoding  
        _utf8_decode: function(utftext){
            var string = "";
            var i = 0;
            var c = c1 = c2 = 0;
            
            while (i < utftext.length) {
            
                c = utftext.charCodeAt(i);
                
                if (c < 128) {
                    string += String.fromCharCode(c);
                    i++;
                }
                else 
                    if ((c > 191) && (c < 224)) {
                        c2 = utftext.charCodeAt(i + 1);
                        string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                        i += 2;
                    }
                    else {
                        c2 = utftext.charCodeAt(i + 1);
                        c3 = utftext.charCodeAt(i + 2);
                        string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                        i += 3;
                    }
            }
            return string;
        }
    }